86 CORDON TRAINING. 



CHAP. XIV. 



REMARKS ON TREES IN POTS. 



THE Cordon system, in its various forms, is 

 admirably adapted for potted trees.* My own 

 trees in pots have succeeded admirably, and 

 there really seems no other way of treating 

 them. The only real difficulty I have ever 

 experienced in Orchard-house culture, has been 

 to keep away the red spider. The green aphis, 

 when neglected in the spring, has sometimes 

 destroyed the fruit of whole trees, with the ends 

 of the young shoots. But as this did no.t form 

 a part of the Cordon system, it produced confu- 

 sion in every part. But there is a remedy. 

 The green fly is easily destroyed by mixing two 

 ounces of tobacco in a quart of boiling water, 

 and when cool, gently brushing the leaves up- 

 wards with a soft brush, dipped in the infusion. 

 The blue aphis on the plum, and the dreadful 

 black on the cherry, are to be similarly welcomed. 



* See pages 54, 55, and 56, Orchard-House ; by Mr. Elvers. 



